If our understanding of physics and the makeup of matter is correct, then we can already postulate what elements there can be. There are a few elements that have been created in particle accelerators to prove theories as is seen in the current table of elements, any additional ones will be heavier and possibly more radioactive. One might even be dilithium :-)

Isn't Yale home of the Skulls?
Those guys would never ruin the diamond market.
I bet on THAT planetary neighborhood, nobody thinks diamonds are valuable. The see our planet as having WATER...much more valuable...which we will understand sooner or later.

"Of course, if we could efficienty reach to 55 Cancri e, it would sure kill today's diamond industry!"
So would an end to the diamond monopoly. Diamonds are not particularly rare here on Earth, but their price is not set by the usual laws of supply & demand.

The planet should be considered a rough stone diamond planet and doesn't have as much value as the same planet set with rings. A diamond planet with rings could be considered a finished "set diamond planet" and would be of much higher value.

I remember "Bones" (Dr. McCoy) treating some kind of silicate-based life form's phasor wound with a plastic cement-like concoction he mixed up. The monster recovered and in return quit attacking the miners and instead bored tunnels for them (think they were mining dilithium for their warp drives?).
Interesting to think of what strange life forms may exist on these worlds. Equally interesting is pondering what kind of yet-unknown elements may exist out there. If the known universe was created as described in the big-bang theory, one might deduce that their are not very many unknown elements left to be discovered. Or is that arrogant and narrow minded thinking?

A good finding.The engineers are brainy and experienced to arrive at these results. Next step will be to find out methods to confirm their assessments by performing suitable experiments.Then send space ships with robots to bring the diamond to the earth.Ultimately this will make this research use full.